No more advices for a new cluster ? Sorry for these multiple posts but I had some trouble with ML. I'm getting "Access Denied" Il giorno ven 11 mag 2018 alle ore 10:21 Gandalf Corvotempesta < gandalf.corvotempesta@xxxxxxxxx> ha scritto: > no more advices for a new cluster ? > Il giorno gio 10 mag 2018 alle ore 10:38 Gandalf Corvotempesta < > gandalf.corvotempesta@xxxxxxxxx> ha scritto: > > Il giorno gio 10 mag 2018 alle ore 09:48 Christian Balzer <chibi@xxxxxxx > > ha scritto: > > > Without knowing what your use case is (lots of large reads or writes, or > > > the more typical smallish I/Os) it's hard to give specific advice. > > 99% VM hosting. > > Everything else would be negligible and I don't care if not optimized. > > > Which would give you 24 servers with up to 20Gb/s per server when both > > > switches are working, something that's likely to be very close to 100% > > > of the time. > > 24 servers between hypervisors and storages, right ? > > Thus, are you saying to split in this way: > > switch0.port0 to port 12 as hypervisor, network1 > > switch0.port13 to 24 as storage, network1 > > switch0.port0 to port 12 as hypervisor, network2 > > switch0.port13 to 24 as storage, network2 > > In this case, with 2 switches I can have a fully redundant network, > > but I also need a ISL to aggregate bandwidth. > > > That's a very optimistic number, assuming journal/WAL/DB on SSDs _and_ > no > > > concurrent write activity. > > > Since you said hypervisors up there one assumes VMs on RBDs and a mixed > > > I/O pattern, saturating your disks with IOPS long before bandwidth > becomes > > > an issue. > > Based on a real use-case, how much bandwidth should I expect with 12 SATA > > spinning disks (7200rpm) > > in mixed workload ? Obviously, a sequential read would need about > > 12*100MB/s*8 mbit/s > > > The biggest argument against the 1GB/s links is the latency as > mentioned. > > 10GBe should have 1/10 latency, right ? > > Now, as I'm evaluating many SDS and Ceph, on the paper, is the most > > expensive in terms of needed hardware, > > what do you suggest for a small (scalable) storage, starting with just 3 > > storage servers (12 disks each but not fully populated), > > 1x 16ports 10GBaseT switch, (many) 24ports Gigabit switch and about 5 > > hypervisors servers ? _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |